. 2024 Jan 17;9(4):4300–4316. doi: 10.1021/acsomega.3c05321

Table 4. Levels of Different Variables and Experimental Range for Basic Brown 1 (BB₁) and Basic Orange 2 (BO₂) Dye Adsorptions.

variables	symbol	low level (−1)	high level (+1)
initial concentration (ppm)	X₁	20	100
time (min)	X₂	20	100
temperature (°C)	X₃	20	50

Table 4. Levels of Different Variables and Experimental Range for Basic Brown 1 (BB1) and Basic Orange 2 (BO2) Dye Adsorptions.